Aeternum M6 φ19mm

The brand name “AURA” comes from Latin, meaning a subtle fragrance or atmosphere, while “ARCA” means a box that holds what is precious. Writing is an act of engraving thoughts and preserving memories. Like a treasure box that quietly safeguards irreplaceable moments experienced through the five senses, AURA ARCA creates system planners that stay close to the heart.

Founder Yoshiaki Mukai spent nearly 25 years involved in product development at Ashford, one of Japan’s leading system planner brand, helping to cultivate the culture of system planners in Japan. In the spring of 2025, he launched this new brand and began a fresh chapter in his journey.

AURA ARCA’s philosophy of “Quiet Luxury” expresses the sense of richness and refinement that a system planner brings to everyday life. The brand pursues luxury not only in design, but also in the materials it uses.

For Aeternum, exceptionally fine calfskin was selected. This leather has a high fiber density and an exceptionally smooth grain surface, offering a natural luster and an elegant, refined finish. Such a premium material is crafted by skilled artisans who have a deep understanding of the structure and manufacturing of system planners.

Designed to accumulate daily records and to be used for many years, this model embodies a refined aesthetic that enriches the system planner lifestyle down to the smallest details. The ring mechanism features one of the largest sizes available for a Mini 6 format at 19 mm, yet the overall width is kept minimal so the planner appears slim. Its beautiful proportions make it comfortable to hold and light and effortless to carry.

H120 × W110 mm (without flap)

250g

Genuine leather (cowhide)
・Calf
・Shoulder leather